The Overland 4TB Enterprise 3.5" Internal Hard Drive (4 Pack) is the first data storage that you don't have to provision. At the core of this revolution is DynamicRAID, a standards-based technology that gives you the ability to automatically expand storage pools and storage volumes independently, optimize your data protection levels and increase capacity with zero downtime. DynamicRAID provides the flexibility you need to manage your storage infrastructure without manual intervention, so that your business can grow without interruption. SnapServer DX is the simplest unified NAS and iSCSI SAN storage for modern business applications - from virtualized server and Microsoft Exchange environments to backup and storage consolidation. Built on the proven GuardianOS platform with integrated features like snapshots and replication, SnapServer DX lets any business run its storage like an enterprise.